MAX931ESA-T

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Linear - Comparators

The MAX931ESA-T is part of linear-comparators family and is used for a range of applications. Its function is to compare two analog signals and provide an output if one of the inputs is greater than the other. It is a fully differential single supply comparator that features an open-drain output stage and two independent inputs. In addition, it can provide rail-to-rail and adjustable offset voltage gains.

Features

• Open-drain output
• Low supply current
• Input common-mode range extends to ground and VCC
• Separate VCC and VCCD pins
• Symmetrical hysteresis
• Low bias current
• Low noise
• Wide operating temperature range

Applications

• Level detectors
• Limit/overload detection
• Thermal protection
• Portable EFIEs
• Battery chargers
• Power supplies
• Motor speed measurement
• Water level alarms

Working Principle

The MAX931ESA-T linear-comparator has two inputs: VI(+) and VI(-). By comparing the two input voltages, it produces an output signal, which is either active low or active high depending on the comparator configuration. The output operates using open-drain technology, hence the output stage has to be pulled up to a voltage level using an external pull-up resistor or other equivalent circuitry, in order for the comparator to function correctly. The comparator’s output can be connected to either active low or active high operation, depending on the choice of VCC.

Configuration and Operation

Inputs can be configured using either the Input Control pins or the voltage-feedback pins, depending on the desired application. The Input Control pins (VCM1 and VCM2) provide control over the input common-mode voltage, while the voltage-feedback pins (VP and VS) provide control over the output stage.

The MAX931ESA-T is also designed to operate in either hysteresis or window mode with the input signal level determining the comparator’s active-high or active-low operation. When the signal level exceeds the voltage set by the hysteresis or window thresholds, the comparator’s output will become active low, and when the signal level falls below the hysteresis or window thresholds, the output will become active high.

Conclusion

The MAX931ESA-T is a versatile linear-comparator that can be used for a variety of applications. Its ability to operate on both active-high and active-low output, its wide operating temperature range, and its adjustable offset voltage gains make it an attractive choice for engineers looking for precision and accuracy in their designs.

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